Floor sanding machine



July 27,1937. v VAAMBRQQM 2,087,933

.FLOOR SANDING MACHINE Filed. Feb/27, 1937 Patented July 27, 1937 UNITED STATES PATENT OFFICE FLOOR SANDING MACHINE Armando Ambrosini, Hartford, Conn.

Application February 27, 1937, Serial No. 128,225

8 Claims.

This invention relates to those machines which are designed for sand-papering and polishing floors, of the type which comprises an abrasive roll mounted upon a horizontal shaft which is driven by an electric motor.

The object of the invention is to' provide a relatively simple machine of this type which is so constructed that it may be readily adapted for sanding or polishing floors with rolls of different diameters that abrade with their peripheral surfaces rather than their faces in order that smooth surfaces, without scratches or mars, may be obtained close to walls andin corners, as well as over the main body of, a floor, which construction also permits the rolls to be projected into small or low spaces, as under radiators, desks, bookcases and the like.

In attaining this end the horizontal shaft that x has means whereby sanding or polishing rolls of different axial lengths, and different diameters may be readily attached,'is carried by a bed and detachably mounted on the bed is an electric motor, the shaft of which is belted to the roll shaft. The bed which carries the roll shaft and motor is adjustably mounted on a base, and this base is detachably mounted on a sub-base. -When a roll of large diameter is to be used the sub-base is employed to support the machine and retain the eripheral surface of the roll in proper relation to the surface to be sanded or polished. When a roll of smaller diameter is to be used the subbase is removed and the machine is supported by the base. For lighter work both the sub-base and the base can be removed and thesanding or polishing elements be supported by the bed, and the motor detached and connected therewith by a suitable connection. Antifr'iction traction means are arranged so that under any of the conditions mentioned the machine may be easily moved over the surface of a floor, and adjustments are provided so that under all conditions the rolls may be positioned to' contact with the floor with the required pressure and without danger of digging in, scratching or marring the surface. The sanding roll is enclosed in a casing and attached to the motor shaft is a suction fan that is connected with the casing so as to collect such dust and abraded material as is produced by the action of the roll;

In the accompanying drawing Fig; 1 is a side elevation of the machine with portions of the base. sub-base and roll housing in section.

Fig. 2 shows an elevation of the motor end of the machine.

Fig. 3 shows an elevation of the roll end of the machine, with the roll housing in section.

Fig. 4 is a transverse section on line 44 on Fig. 1. I

Fig. 5 is a transverse section on line 5-5 on Fig. 1.

Fig. 6 is a horizontal section on line 6-6 on Fig. 1.

Fig. 7 is a side view showing the machine with a smaller roll and the sub-base removed.

Fig. 8 is a view on smaller scale showing the motor detached. j

In the machine illustrated the sanding or polishing roll i, which may be made of any suitable material, preferably of disks of wood clamped face to face, has an abrasive peripheral surface 2 of ordinary sheets of sand paper secured by any conventional means. This roll is fastened on a spindle 3 which is detachablyconnected with the front end of a shaft 4 that turns in bearings 5 set in the bed 6. Fastened on the other end of the shaft is a pulley l. A housing 8 attached to the bed is arranged to enclose the sanding or polishing roll.

Any common type of electric motor 9 may be employed. The motor shown is secured to the bed by screw bolts lll'with interposed cushioning springs H. On the front end of the armature shaft I2 is a pulley 13 that is connected by a belt M with the pulley l on the roll shaft. The springs ll not only absorb vibration resulting from the action of the machine but tend to keep the motor raised and the belt taut. On the rear end of the armature shaft is an exhaust fan l5 that is connected by a tube I6 with the roll housing 8 so as to collect all dust and matter abraded from a floor by the action of the roll. In the base of the motor are four anti-friction balls I! for the purpose of allowing the motor to be moved freely on a floor if it is used disconnected from the bed.

. The bed 6 is set in a channel-shapedbase 18 with the end furthest from the roll held thereto by pivots l9. At the other end between the bed and the base are springs 20 which tend to lift 45 that end and normally hold the periphery of the roll slightly above operative position. Screw bolts 2| prevent a too wide separation of the under surface of the bed and upper surface of the base. The front end of the base is forked and has an opening 22 of suflicient size to permit .the periphery of the roll to be extended down below the under surface of the base. The base near the pivot'end has balls 23 which afford an anti 55 friction traction for that end of the base when the machine is used with the sub-base removed.

The sub-base 24 is channel-shaped and receives the base l8, being normally secured thereto by screw bolts 25 which extend loosely through the sub-base, base and bed and into nuts 26 above the bed. Means, such as nuts 2'5, are arranged on the screw bolts between the base and sub-base to retain these elements separated. The rear end of the sub-base is provided with traction balls 28, and the front end of the sub-base is forked, the opening 29 being of a size which allows the periphery of the roll to extend through the fork.

A long handle 30 is pivoted to the bed, and a hand grip 3| is fastened to the bed, near the roll end of the machine.

In normal use with a large roll the base is secured in the channel of sub-base by the screw bolts 25 and nuts 26, and 27, the bed is secured in the channel of the base by the pivots l9 and the nuts on the screw bolts 2|, and the motor is secured to the bed by the nuts on the screw bolts It. When a smaller roll is to be used the large roll is disconnected from the shaft 4 and the smaller roll substituted. The screw bolts 25 and nuts 27 are taken out and the sub-base removed. With either the large or small roll the front end of the machine may be moved back and forth by the long handle 38 or by the grip 3| that are attached to the bed, the other end of the base or sub-base, according to the conditions, moving freely on the traction balls. With the machine running downward pressure applied through the handle or the grip will bring the periphery of the roll being used into contact with the floor to be sanded or polished, the springs 25} yielding to permit this. Whether or not the sub-base is employed the springs H cushion the motor and exert tension to keep the belt M between the pulleys tight. The long handle may be disconnected if desired, and the grip may also be disconnected should it be desired to sand or polish a section of a floor beneath some fixed object. If desired the motor may be disconnected by removing nuts from the screw bolts Ill and its armature shaft be connected with the roll shaft 4 by a flexible cable 32, Fig. 8.

The invention claimed is:

1. A sanding machine comprising a sub-base, a base detachably mounted on said sub-base, a bed mounted on said base, means near one end hinging the bed to the base, spring means near the other end thrusting between the bed and base, a roll shaft rotatably carried by said bed, a sanding roll connected to said shaft, an electric motor, and a driving connection between the motor armature shaft and the roll shaft.

2. A sanding machine comprising a longitudinally extending bed, a roll shaft rotatably mounted on and extending longitudinally of said bed, a pulley on one end of said shaft, a sectional cylindrical roll detachably connected to the other end of said shaft, an electric motor mounted on said bed With its armature shaft extending longitudinally of said bed, a pulley on the motor armature shaft, a driving belt connecting said pulleys, a plurality of bolts and nuts loosely securing the motor to the bed, springs on said bolts thrusting between said motor and the bed, said springs cushioning the motor and keeping the belt taut, an exhaust fan connected to the armature shaft, and a conduit leading from the fan to the vicinity of said roll.

3. Asanding machine comprising a longitudinally extending bed, a roll shaft rotatably mounted on and extending longitudinally of said bed, a pulley on one end of said shaft, a sectional cylindrical roll detachably connected to the other end of said shaft, an electric motor detachably mounted on the bed with its armature shaft extending longitudinally of said bed, a pulley on the motor armature shaft, a driving belt connecting said pulleys, a plurality of bolts and nuts loosely securing the motor to the bed, and springs on said bolts thrusting between said motor and the bed, said springs cushioning the motor from the bed and roll and keeping the belt taut.

4. A sanding machine comprising a sub-base, a base mounted on the sub-base, means securing together but spacing apart said sub-base and base, a bed yieldingly mounted on the base and detachably secured to said base by the said means that secures the sub-base to the base, a roll shaft rotatably carried by said bed, a sanding roll connected to said shaft, an electric motor detachably mounted on said bed, and a driving connection between the motor armature shaft and the roll shaft.

5. A sanding machine comprising a troughshaped sub-base, a trough-shaped base detachably mounted in said sub-base, a bed mounted in and hinged to said base, a roll shaft rotatably carried by said bed, a sanding roll detachably connected to said shaft, an electric motor, and a driving connection between the motor armature shaft and the roll shaft.

6. A sanding machine comprising a sub-base with a forked end, a base with a forked end, a

bed mounted on and hinged to said base, a roll shaft rotatably mounted on said bed, a sanding roll detachably connected to said shaft above the forked openings of said sub-base and base, means normally retaining said roll above said forked openings, means whereby said roll may be depressed into said forked openings, an electric motor, and a driving connection between the motor armature shaft and the roll shaft.

'7. A sanding machine comprising a sub-base with a forked end, a base detachably secured to the sub-base and having a forked end overlying the forked end of the sub-base, a bed detachably secured to the base, a roll shaft rotatably carried by said bed, a sanding roll detachably connected to said shaft with its periphery extending into said forked openings, a casing enclosing said roll and having its edges engaging the edges of the forked edges of the sub-base, an electric motor, a driving connection between the motor armature shaft and the roll shaft, an exhaust fan connected to the armature shaft, and a conduit leading from said fan to said roll casing.

8. A sanding machine comprising a troughshaped sub-base, a trough-shaped base detachably mounted in said sub-base, a bed mounted in said base, means pivoting the bed to the base near one end, yielding means connecting the bed and base near the other end, a roll shaft with its axis extending transversely with respect to the axis of said bed pivoting means rotatably carried by said bed, a sanding roll connected to said shaft, a casing enclosing said roll, an electric motor, a driving connection between the motor armature shaft and the roll shaft, an exhaust fan driven from the armature shaft, and a conduit connecting the fan with the roll casing.

ARMANDQ AMBROSINI. 

